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Intangible Assets - Estimated Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remainder of 2019 $ 2,000
2020 2,491
2021 2,352
2022 2,313
2023 1,725
2024 $ 1,631